Hey, if you got the money and you want a better gaming experience (depends on the game), you may want to spend more. And lots of people don't upgrade for years and years. If you said "Anything over $1,500 is getting wasteful" then I might agree.
But of course, if you can only spend $700-800 (after MIR), then there is nothing wrong with that and you can get pretttty good comps. Gurusans build he just picked out is nice.